Far as I know, there aren't any step-by-step templates for DC-15A's. I just did the measuring and everything myself according to a reference picture, and used some other pictures to get the detailing. The most important thing is the length, I scaled everything according to that, and I'm building mine at 1.3m.
WOF does have a blueprint up, you can find that on CTN, I myself didn't actually use it. There's a few DC-15A projects on CTN, I recommend having a look at those. There's a few different methods in attaching things, shapes and dimensions etc. But it's really up to you as to how detailed you want it, how heavy/light, materials, etc. I've seen some that may as well have jumped out of the film, and others which are clearly a bit rougher.